Crimping pliers

The invention relates to a pressing pincer for a pressing apparatus for connecting a Pipe section with a pressfitting according to the preamble of the independent Claims 1 and 6. FIG.

From DE 196 31 019, a pressing device is known which crimping pliers to connect comprises a pipe with a press fitting. The pressing pliers includes two Swing arms, which pivot between two same means of a respective pin T-shaped Carrier plates are hinged. The pivot arms are at one end with a Contact surface for the press cylinder of the pressing device, the system provided. At the opposite end they are as jaws with mutually facing Pressing surfaces configured. The linkages for the bolts are located at the Outer plates at a distance. In the area of ​​the free end of the T-shaped carrier plates is a photograph of a connection pin for connection to the Pressing unit. When using this device, the crimping pliers is now back to Pressing unit pulled. The pivot arms slide with their contact surfaces at Pressing Unit along backwards. The tensile force is about the connecting pin on the T-shaped transmitted carrier plates. Thus, the swing arms pivot about the Bearing bolt and the clamping jaws are moved towards each other and compressed. One disadvantage of these jointing clamp is that the Pivoting jaws around the bearing bolt to the T-shaped carrier plates free pivotally. Therefore, the pivoting jaws against each other along a move certain degree. This causes the start of pressing the Jaws and thus the actual clamping surfaces against each other in the longitudinal direction may be shifted slightly. This then gives an inaccurate pressing of the fittings with the pipe. There is also the risk that the fitting and / or tube at the start of Pressing are so damaged that a sealing connection is not guaranteed is.

Object of the invention to provide a crimping pliers mentioned type, which is a inaccurate start of the pressing operation is prevented and the resulting disadvantages overcomes.

This object is achieved by the specified in the claims the invention.

The invention is described below in connection with the drawings. Show it:<dl tsize="7"><dt>figure 1</dt><dd>a pressing device with a pressing jaw according to the invention;</dd><dt>figure 2</dt><dd>crimping pliers according to prior art in plan view;</dd><dt>figure 3</dt><dd>an inventive crimping pliers as Explosionszeichneung and</dd><dt>figure 4</dt><dd>a particular embodiment of the centering pin</dd></dl>

1 shows a pressing machine with associated, interchangeable crimping pliers's view shown. The pressing unit 2 comprises a drive unit and a connection unit for connection with a crimping tool 1. The connection unit is composed of two Holding plates 22. The pressing tongs 1 with its two T-shaped carrier plates 11, 11 ' inserted between the holding plates 22nd a connecting bolt 22 Then by the holding plates and a receiving port 112 to the T-shaped carrier plates 11, 11 'pushed through and secured. The pressing unit is now ready for use. The crimping pliers 1 is in operation at its two pivot arms 12 Contact surfaces 23 on the unit 2 to rest. Upon further retraction of the pressing pliers 1, the swing arms 12 pushed outside to sideways and thus the pressure completed.

2 shows the crimping pliers 1 is shown more in detail. It refers to such a prior art. The pressing tongs 1 comprises two T-shaped Support plates 11, 11 '. The support plates 11, 11 'have the beam portion on each side a Bolt bearing 113, 113 'on. At the free end is the receiving port 112 for receiving the connection pin 21. The pivot arms 12, 12 'are connected between the two T-shaped carrier plates 11, 11 'pivotally mounted each by means of a Bearing pins 13, 13 ', which in the pin bearing arrangements 113 113' are held. The Pivot arms 12, 12 'forming the front of the jaws 14, 14', which oppositely directed pressing surfaces 15, 15 'exhibit. The pressing faces 15, 15 ' form in the closed state of the crimping pliers an opening which corresponds approximately to the Diameter of the pipes to be pressed respectively. Joints equivalent. These Opening is limited by front end edge 16 and rear end edges 17th in the closed state rest on one another, the end edges of both jaws. The Bearing pin 13 can by securing rings 131 to the T-shaped carrier plates be 11, 11 'secured.

Moderately invention both swing arms will now (12, 12 ') by means of a Operatively connected so connected that they forcibly equally and oppositely pivotally. The operative connection of the two pivot arms (12, 12 ') consists of approximately form-fitting interlocking catch elements.

As the elements of the crimping pliers is 1 assembled from the Explosionzeichung Figure 3 clearly visible. The pivot arms are now According to the invention 'are each provided with a storage area 181, 181st The storage area is located approximately on an imaginary connecting line between the pivot bearings 132, through which the bearing pin are performed. 13 Each storage area includes a Half of a bearing for a guide pin 183. This storage includes a Bearing cup 182, 182 ', which guide pins 183 each by less than half embraces. This is necessary since the pivot arms 12, 12 'when actuating the Pivot bearing 132 to pivot and thus a little to the Guide pins 183 rotate. Since the guide pin, the two storage areas 181, 181 ' and thus the swing arms 12, 12 'rotatably connected to each other, so both Swivel arms forcibly equally and oppositely pivoted. This means, that the guide pin 183, the pivot movement of the pivot arms 12, 12 ' symmetrical leads. Thus, the clamping jaws 14, 14 'with the pressing surfaces 15, 15 'also exactly symmetrical pivoted and each pressing takes equal accuratly.

Upon actuation of the pivot arms 12, 12 'is, for geometric reasons of Guide pins in relation to the T-shaped carrier plates 11, 11 'in the longitudinal direction of something moved backwards or forwards. Therefore, he does not allow the carrier plates 11, be 11 '. It is therefore provided with the smoothest possible faces, so he as smoothly as possible to the inner surfaces of the T-shaped carrier plates slides. In an improved embodiment, the storage areas 181, 181 ' 'Provided with bolt guide surfaces 185 between the bearing shells 182, 182nd Of the Guide pins 183 now includes paragraphs on 1831, which form stop surfaces 1832nd The guide pin 183 is now 182 'held in the bearing shells 182, rotatable, He carried with his stop surfaces 1832 by the pin guide surfaces 185 Strike is performed. The guide pin 183 is running so short that he in Storage area is maintained properly and thereby with its ends not in contact with the inner surfaces of the T-shaped carrier plates 11, 11 'may occur.

A further improvement of the crimping pliers is inserting a bracing 184 reached. It is now possible to design the expanding spring 184 as a spiral spring which the guide pin 183 at least partially, preferably several times, embraces. The Expanding spring 184 as a coil spring made of spring steel wire keeps extraordinarily many Load cycles was and is not prone to breaking. She is also the guide pin 183 properly mounted and guided awarded.